PPPOE radius Authentication

Hi guys
I just enabled PPPOE on my RB433 and also configured it for radius authentication
To my greatest supprise, it could not authenticate via Radius (Userman)
When I checked the Radius debug meaasge I found

Access-Accept

message and

0.0.0.0,USERNAME, auth ok

In the Userman I added PPPOE server as router, assign IP address for the user
And I also assign PPPOE IP in the PPPOE sever profile.

When PPPOE client on WINXP tries to connect, it gives

Error 691: Access denied, invalid username/password

PPPOE local users works well but radius users did not.
Pls,
What could be the problem.

which version of ROS you are using ?

yes i got the same error, and meanwhile if i use another pc as radius server the pppoe works.

Userman = ROSv4.11
PPPoE server = ROSv4.16